]> git.baikalelectronics.ru Git - kernel.git/commit
s390/decompressor: fix initrd corruption caused by bss clear
authorMarcelo Henrique Cerri <marcelo.cerri@canonical.com>
Mon, 13 Mar 2017 15:14:58 +0000 (12:14 -0300)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Wed, 22 Mar 2017 07:21:20 +0000 (08:21 +0100)
commitdfeb409a2e2c671c8e63bf98253044c9df728b87
tree1df90d96f517b78090aac0f32f6e19f25051ba0e
parent8a6c93296af58591fab5b8bb74090fafbae9085e
s390/decompressor: fix initrd corruption caused by bss clear

Reorder the operations in decompress_kernel() to ensure initrd is moved
to a safe location before the bss section is zeroed.

During decompression bss can overlap with the initrd and this can
corrupt the initrd contents depending on the size of the compressed
kernel (which affects where the initrd is placed by the bootloader) and
the size of the bss section of the decompressor.

Also use the correct initrd size when checking for overlaps with
parmblock.

Fixes: b0437d4412d6 ([S390] fix boot failures with compressed kernels)
Cc: stable@vger.kernel.org
Reviewed-by: Joy Latten <joy.latten@canonical.com>
Reviewed-by: Vineetha HariPai <vineetha.hari.pai@canonical.com>
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/boot/compressed/misc.c